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3719602c PC |
1 | /* Copyright (C) 2010-2020 The RetroArch team |
2 | * | |
3 | * --------------------------------------------------------------------------------------- | |
4 | * The following license statement only applies to this file (float_to_s16_neon.S). | |
5 | * --------------------------------------------------------------------------------------- | |
6 | * | |
7 | * Permission is hereby granted, free of charge, | |
8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation the rights to | |
10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | |
16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
21 | */ | |
22 | #if defined(__ARM_NEON__) && defined(HAVE_ARM_NEON_ASM_OPTIMIZATIONS) | |
23 | ||
24 | #if defined(__thumb__) | |
25 | #define DECL_ARMMODE(x) " .align 2\n" " .global " x "\n" " .thumb\n" " .thumb_func\n" " .type " x ", %function\n" x ":\n" | |
26 | #else | |
27 | #define DECL_ARMMODE(x) " .align 4\n" " .global " x "\n" " .arm\n" x ":\n" | |
28 | #endif | |
29 | ||
30 | asm( | |
31 | DECL_ARMMODE("convert_float_s16_asm") | |
32 | DECL_ARMMODE("_convert_float_s16_asm") | |
33 | "# convert_float_s16_asm(int16_t *out, const float *in, size_t samples)\n" | |
34 | " # Hacky way to get a constant of 2^15.\n" | |
35 | " # ((2^4)^2)^2 * 0.5 = 2^15\n" | |
36 | " vmov.f32 q8, #16.0\n" | |
37 | " vmov.f32 q9, #0.5\n" | |
38 | " vmul.f32 q8, q8, q8\n" | |
39 | " vmul.f32 q8, q8, q8\n" | |
40 | " vmul.f32 q8, q8, q9\n" | |
41 | "\n" | |
42 | "1:\n" | |
43 | " # Preload here?\n" | |
44 | " vld1.f32 {q0-q1}, [r1]!\n" | |
45 | "\n" | |
46 | " vmul.f32 q0, q0, q8\n" | |
47 | " vmul.f32 q1, q1, q8\n" | |
48 | "\n" | |
49 | " vcvt.s32.f32 q0, q0\n" | |
50 | " vcvt.s32.f32 q1, q1\n" | |
51 | "\n" | |
52 | " vqmovn.s32 d4, q0\n" | |
53 | " vqmovn.s32 d5, q1\n" | |
54 | "\n" | |
55 | " vst1.f32 {d4-d5}, [r0]!\n" | |
56 | "\n" | |
57 | " # Guaranteed to get samples in multiples of 8.\n" | |
58 | " subs r2, r2, #8\n" | |
59 | " bne 1b\n" | |
60 | "\n" | |
61 | " bx lr\n" | |
62 | "\n" | |
63 | ); | |
64 | #endif |